Formation of oxide phases in the system Fe2O3-NiO

Abstract

Mixed metal oxides in the system Fe2O3-NiO were prepared by coprecipitation of Fe(OH)3/Ni(OH)2 and the thermal treatment of hydroxide coprecipitates up to 800 or 1100°C. X-ray diffraction showed the presence of α-Fe2O3, NiO and NiFe2O4 in samples prepared at 800°C. The oxide phases α-Fe2O3, NiO, NiFe2O4 and a phase with structure similar to NiFe2O4 were found in samples prepared at 1100°C. Fourier transform-infrared spectra of oxide phases formed in the system Fe2O3-NiO are discussed. Two very strong infrared bands at 553 and 475 cm−1, a weak intensity infrared band at 383 cm−1 and two shoulders at 626 and 441 cm−1 were observed for α-Fe2O3 prepared at 1100°C. NiFe2O4, prepared at the same temperature, showed two broad and very strong infrared bands at 602 and 411 cm−1, while NiO showed a broad infrared band at 466 cm−1. Fourier transform infrared spectroscopic results were in agreement with X-ray diffraction.

Keywords

Oxide Polymer Fourier Hydroxide Fourier Transform

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